ML19261E890
| ML19261E890 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/08/1977 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19261E887 | List: |
| References | |
| GQL-0334, GQL-334, NUDOCS 7910170947 | |
| Download: ML19261E890 (2) | |
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POSI OFFICE BOX 542 READING, PENNSYLVANIA 19603 TELEPHONE 215 - 929-3601 June 8,_1977 GQL 033h Mr. J. P. O'Reilly, Director Office of Inspection & Enforcement, Region I U. S. Nuclear Regulatory C - 4ssion 631 Park Avenue King of Prussia, PA 190h6
Dear Sir:
As a follow-up to your on-site inspection of Three Mile Island Nuclear Station, Unit #1 on January 27, 1977, ycu requested a su nry of the results of the underground river water piping thrust block ~61evatiEn Tu?FefsIBelov'is the survey data results up to and including the May 27, 1977 survey. All elevations are listed in feet above sea level. The Dece=ber elevation was initially obtained by a survey of the top of the surveillance tube pipe threads.
In order to correct this survey to show the actual elevation of the thrust biccks, another survey was required.
This additional survey was taken to obtain the distances frem the top of the pipe threads to the point on the thrust blocks where the elevations are being made.
Once this su Arvvas cc=pleted and these distances cceputed, they were then subtracted frcm the original December survey to obtain the base line elevation of the thrust blocks.
20" Reacter Bldg. 3 30" Nuclear Services 2h" Decay Heat Energ. Ccoling Date of Survey River Water Thrust Block River Water Thrust Bicek Thrust Bleck Dec. 8 296.110 295. P" 294.937 Jan. 1 296.110 29h.735*
29h.910 Jan. 21
- 296.100 295 200 29h.900 Feb. h 296.100 295 192 29h.917 Feb. 18 296.10h 293 19h 29h.91h Mar. 7 296,109 295 199 29h.919 Mar. 2h 296.105 295.193 h
29.938 Apr. 11 296.102 295 193 29h.915 Apr. 29 296.107 295.195 29h.915 May 13 296.110 29.197 29h.915 May 2~
296.107 295.200 29h.922
(*Errene. a reading - should be disregarded) 1483 117 1910170
June 6, 1977
' q.* P. O'Reilly, Director GQL 033h
,O As can be seen, results of this data show that these lines are still vell within our surveillance criteria to provide sufficient flexibility to meet all seismic class 1 requirements.
Sincerely, J. G. Herbein Vice President JGH:DGM:kl 1483 118 s